[PATCH] Add missing <cassert> include to testcase

[Jonathan Wakely]

This performance test has been broken since we modified VERIFY to not
depend on assert. This fixes it.

	* testsuite/util/performance/priority_queue/mem_usage/pop_test.hpp:
	Include <cassert> header.

Tested x86_64-linux. Committed to trunk.

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commit d89e1655fd1475a16a4a2b338f679451206d792c
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Jan 6 17:11:40 2017 +0000

    Add missing <cassert> include to testcase
    
    	* testsuite/util/performance/priority_queue/mem_usage/pop_test.hpp:
    	Include <cassert> header.

diff --git a/libstdc++-v3/testsuite/util/performance/priority_queue/mem_usage/pop_test.hpp b/libstdc++-v3/testsuite/util/performance/priority_queue/mem_usage/pop_test.hpp
index f9ed1db..15c0552 100644
--- a/libstdc++-v3/testsuite/util/performance/priority_queue/mem_usage/pop_test.hpp
+++ b/libstdc++-v3/testsuite/util/performance/priority_queue/mem_usage/pop_test.hpp
@@ -42,6 +42,7 @@
 #include <ext/pb_ds/detail/type_utils.hpp>
 #include <performance/io/xml_formatter.hpp>
 #include <common_type/priority_queue/string_form.hpp>
+#include <cassert>
 
 namespace __gnu_pbds
 {